On Sunday, April 8, 2018 at 9:22:40 AM UTC+1, Graham Easterling wrote:
The astronomical tidal range at Newlyn on a very big Spring tide is around 6m

The tidal range tomorrow afternoon is just 1.6m, from high tide (3.9m) to low tide (2.3m). (Predicted heights are above Chart Datum). In practice both figures are likely to be slightly higher than the astronomical prediction, but the range will probably be pretty much spot on.

1.6m is the smallest the tide gets at Newlyn (until someone else points out a smaller tide!)

Graham
Penzance

Having just perused the tide tables, it's the smallest astronomical tide of 2018, though a March tide came close, and smaller than anything in 2017.

Graham
Penzance